Here is my take:
Both of the other two comments do point out issues in your game (well done champ and djp), both point out the low back swing for sure, and it was also mentioned that you lost the ball off your hand as well as you didn't keep your balance at the line and you fell off the shot.
Now, what I think the big issue is:
You are taking a 5 step approach, which is fine, but in a 5 step you should be putting the ball into the swing on the second step (first step with right foot). Right now you move the ball an entire step late, which causes you to cut your backswing off to help get your closer to proper timing (accounts for the low backswing) and also means you have to pull the ball from the top of your backswing down to your release to bring that timing even closer to true (accounts for the ball dropping and falling off the shot). Chances are you do need tape, 90% of bowlers that I have ever worked with needed more tape than they were using and were just too scared that the ball would hang up on their hand.
So, move the ball as if it were tied to your right foot, when that foot moves the ball has to move as well. By moving it late it is causing you to cut your backswing off and pull the ball through your release meaning that you drop the ball and also fall off balance at the line because of the lack of a relaxed swing.
I think once you get the timing in order you will notice a huge improvement in your game almost immediately.
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